To hear a couple of quintets will cheer you up! (7)

I believe the answer is:

hearten

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'quintets will cheer you up' is the definition.
I can't tell whether this defines the answer.

'to hear a couple' is the wordplay.
'a couple' becomes 'ten' (I can't explain this - if you can you should give a lot more credence to this answer).
'hear'+'ten'='HEARTEN'

'of' acts as a link.

Can you help me to learn more?

(Other definitions for hearten that I've seen before include "Inspirit" , "Encourage in Teheran" , "Make (someone) more confident" , "given cheer" , "Inspire anew" .)

I've seen this clue in the Evening Standard.

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